Handheld Digital Anemometer Professional Multifunction Anemograph with Detachable Auxiliary Fan Air Meter with Storage Case This digital multifunctional anemometer is a professional instrument for measurement of wind speed, temperature, and humidity. It is designed for wind speed measurement in various environments, such as wind speed measurement engineering, quality control, and health control. It is applied in wind speed measurement for various occasions like factories, schools, offices, transportation routes, families, etc. Features: Six-wheel design for more accurately measure current wind speed, air volume, temperature and humidity. Wind speed/flow units and temperature units selection. Maximum/Minimum/Average wind speed measurement. 2.9-inch LCD screen with backlight for clearly reading. Real-time measurement when connecting USB with computer software. Automatic shutdown if there is no operation after 5 minutes. Data storage function, which can save up to 960 groups of measured data. Three-axis magnetic field sensor for wind direction angle measurement. Data hold function, low battery indication. Specifications: Material: ABS Wind Velocity Unit: m/s, ft/min, knots, km/h, mph Wind Velocity Range: 0~45m/s, 0~8800ft/min, 0~88knots, 0~140km/h, 0~100mph Wind Velocity Accuracy: ±3%±0.1, ±3%±20, ±3%±0.2, ±3%±0.4, ±3%±0.2 Wind Flow Unit: CFM(FT3/MIN), CMM(M3/MIN) Wind Flow Range: 0~999900ft3/min, 0~999900m3/min Wind Temperature Unit: ℃, ℉ Wind Temperature Range: 0~45℃, 32~113℉ Wind Temperature Accuracy: ±1.0℃, ±1.8℉ Humidity Range: 10~90%RH (non-condensing) Humidity Accuracy: ±5%RH Operation Conditions: 0~50℃(32~122℉), 40~80%RH Storage Conditions: -40~60℃(-40~140℉), ≤80%RH Power Supply: 4 * 1.5V AAA battery (NOT included) Meter Size: 194 * 73 * 38mm / 7.64 * 2.95 * 1.49in Vane Size: 74 * 35 * 268-531mm / 2.91 * 1.38 * 10.55-20.91in(length adjustable) Item Weight: 412g / 14.55oz Package Weight: 1224g / 43.20oz Package Size: 32 * 24 * 8.5cm / 12.60 * 9.45 * 3.34in Packing List: 1 * Anemometer 1 * Vane 1 * USB Cable 1 * Manual (English)